Re: [patch] ldconfig.8: Document file filter and symlink pattern expectations

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On 12/2/19 9:32 PM, DJ Delorie wrote:

Information gleaned from comments in glibc's elf/ldconfig.c

Thanks, DJ. Patch applied.

Cheers,

Michael

diff --git a/man8/ldconfig.8 b/man8/ldconfig.8
index 4f799962c..15585243c 100644
--- a/man8/ldconfig.8
+++ b/man8/ldconfig.8
@@ -93,6 +93,28 @@ option.
  .B ldconfig
  should normally be run by the superuser as it may require write
  permission on some root owned directories and files.
+.PP
+Note that
+.B ldconfig
+will only look at files that are named
+.I lib*.so*
+(for regular shared objects) or
+.I ld-*.so*
+(for the dynamic loader itsef).  Other files will be ignored.  Also,
+.B ldconfig
+expects a certain pattern to how the symlinks are set up, like this
+example, where the middle file
+.RB ( libfoo.so.1
+here) is the SONAME for the library:
+.PP
+.in +4n
+.EX
+libfoo.so -> libfoo.so.1 -> libfoo.so.1.12
+.EE
+.in
+.PP
+Failure to follow this pattern may result in compatibility issues
+after an upgrade.
  .SH OPTIONS
  .TP
  .BR \-c " \fIfmt\fP, " \-\-format=\fIfmt\fP




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